![]() ![]() For the foreseeable future, none that big are headed our way. NASA has identified and tracked almost all of the nearby asteroids of a size that would cause world-altering damage if they ever struck Earth. ![]() Scientists will then watch to see how the asteroid's trajectory changes. The golf-cart-size spacecraft will travel to an asteroid that's more than 6 million miles away - and poses no danger to Earth - and ram into it. In the first real-world test of a technique that could someday be used to protect Earth from a threatening space rock, a spacecraft is scheduled to blast off from Vandenberg Space Force Base in California on Tuesday at 10:20 p.m. NASA is about to launch an unprecedented mission to knock an asteroid slightly off course. An illustration of the DART spacecraft approaching two asteroids it will crash into the smaller one to try to change how this space rock orbits its larger companion. ![]()
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